145
FNCA52 TJSJ 180730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST MON MAY 18 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-182000-
SOUTHEAST COASTAL PLAINS-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 10
TEMP (24H TREND) 90 (+2) 71 (-3) 90
RH % (24H TREND) 47 (-10) 84 (-1) 48
WIND 20FT/EARLY(MPH) E 17 E 13 E 17
WIND 20FT/LATE(MPH) E 17 NE 11 E 17
MIXING HGT(FT-AGL/MSL)5200 5260
TRANSPORT WND (MPH) E 16 E 20
VENT RATE (KT-FT) 72800 89420
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-182000-
SOUTHERN HILLS-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 86 (+3) 68 (-4) 86
RH % (24H TREND) 56 (-12) 95 (+4) 57
WIND 20FT/EARLY(MPH) E 13 E 12 E 14
WIND 20FT/LATE(MPH) E 14 E 12 E 13
MIXING HGT(FT-AGL/MSL)5790 5920
TRANSPORT WND (MPH) E 15 E 20
VENT RATE (KT-FT) 75270 100640
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-182000-
NORTH COASTAL PLAINS-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 20 40
TEMP (24H TREND) 89 (0) 71 (-3) 90
RH % (24H TREND) 54 (-10) 94 (+1) 56
WIND 20FT/EARLY(MPH) E 16 E 17 E 16
WIND 20FT/LATE(MPH) E 20 E 12 E 20
MIXING HGT(FT-AGL/MSL)5270 5610
TRANSPORT WND (MPH) E 20 E 18
VENT RATE (KT-FT) 89590 89760
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-182000-
NORTHERN HILLS-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 0 50
TEMP (24H TREND) 88 (0) 68 (-4) 88
RH % (24H TREND) 57 (-7) 94 (0) 57
WIND 20FT/EARLY(MPH) E 14 E 14 E 14
WIND 20FT/LATE(MPH) E 18 E 9 E 18
MIXING HGT(FT-AGL/MSL)6140 6620
TRANSPORT WND (MPH) E 15 E 16
VENT RATE (KT-FT) 79820 92680
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-182000-
WEST COAST-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 10 30
TEMP (24H TREND) 91 (+1) 71 (-2) 91
RH % (24H TREND) 57 (-7) 91 (-2) 55
WIND 20FT/EARLY(MPH) E 14 E 12 E 14
WIND 20FT/LATE(MPH) E 14 E 12 E 14
MIXING HGT(FT-AGL/MSL)4980 5160
TRANSPORT WND (MPH) SE 13 E 14
VENT RATE (KT-FT) 54780 61920
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-182000-
EASTERN INTERIOR-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 40
TEMP (24H TREND) 87 (+2) 69 (-4) 87
RH % (24H TREND) 57 (-10) 95 (+1) 59
WIND 20FT/EARLY(MPH) E 16 E 16 E 16
WIND 20FT/LATE(MPH) E 14 E 16 E 14
MIXING HGT(FT-AGL/MSL)6010 5970
TRANSPORT WND (MPH) E 15 E 20
VENT RATE (KT-FT) 78130 101490
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-182000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 82 (+2) 67 (-4) 82
RH % (24H TREND) 62 (-16) 98 (+1) 66
WIND 20FT/EARLY(MPH) E 13 E 12 E 13
WIND 20FT/LATE(MPH) E 13 E 11 E 13
MIXING HGT(FT-AGL/MSL)4890 4070
TRANSPORT WND (MPH) E 16 E 20
VENT RATE (KT-FT) 68460 69190
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-182000-
CENTRAL MOUNTAIN RANGE-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 0 50
TEMP (24H TREND) 86 (+4) 65 (-4) 87
RH % (24H TREND) 60 (-9) 96 (+2) 58
WIND 20FT/EARLY(MPH) E 10 E 10 E 11
WIND 20FT/LATE(MPH) E 11 E 9 E 11
MIXING HGT(FT-AGL/MSL)6730 7150
TRANSPORT WND (MPH) E 14 E 16
VENT RATE (KT-FT) 80760 100100
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-182000-
CAYEY MOUNTAIN RANGE-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 30
TEMP (24H TREND) 83 (+3) 68 (-3) 82
RH % (24H TREND) 62 (-12) 98 (0) 65
WIND 20FT/EARLY(MPH) E 12 E 10 E 13
WIND 20FT/LATE(MPH) E 12 E 10 E 12
MIXING HGT(FT-AGL/MSL)5180 5030
TRANSPORT WND (MPH) E 16 E 20
VENT RATE (KT-FT) 72520 85510
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-182000-
VIEQUES-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 30 40
TEMP (24H TREND) 87 (0) 74 (-2) 87
RH % (24H TREND) 59 (-8) 88 (-1) 61
WIND 20FT/EARLY(MPH) E 19 E 19 E 18
WIND 20FT/LATE(MPH) E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL)4260 3990
TRANSPORT WND (MPH) E 18 E 22
VENT RATE (KT-FT) 68160 75810
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-182000-
CULEBRA-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 30 40
TEMP (24H TREND) 89 (+2) 76 (-2) 89
RH % (24H TREND) 56 (-12) 87 (-1) 57
WIND 20FT/EARLY(MPH) E 19 E 19 E 18
WIND 20FT/LATE(MPH) E 17 E 18 E 17
MIXING HGT(FT-AGL/MSL)4290 3920
TRANSPORT WND (MPH) E 20 E 22
VENT RATE (KT-FT) 72930 74480
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-182000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 0 10
TEMP (24H TREND) 91 (+2) 72 (-3) 91
RH % (24H TREND) 48 (-8) 83 (-3) 46
WIND 20FT/EARLY(MPH) E 20 E 17 E 19
WIND 20FT/LATE(MPH) E 21 E 17 E 20
MIXING HGT(FT-AGL/MSL)4970 5270
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 89460 100130
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-182000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 40
TEMP (24H TREND) 86 (+1) 75 (-3) 86
RH % (24H TREND) 60 (-10) 88 (+2) 62
WIND 20FT/EARLY(MPH) E 20 E 19 E 19
WIND 20FT/LATE(MPH) E 17 E 19 E 18
MIXING HGT(FT-AGL/MSL)4360 3870
TRANSPORT WND (MPH) E 22 E 25
VENT RATE (KT-FT) 82840 85140
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-182000-
ST CROIX-
330 AM AST MON MAY 18 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 20 30
TEMP (24H TREND) 87 (+1) 75 (-2) 87
RH % (24H TREND) 60 (-9) 88 (0) 61
WIND 20FT/EARLY(MPH) E 19 E 18 E 18
WIND 20FT/LATE(MPH) E 17 E 17 E 17
MIXING HGT(FT-AGL/MSL)5120 4580
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 92160 87020
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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